WinForm图表问题

Question

I'm trying to create a chart based on a dataTable . The table contains only two columns, names and count:

+-------+-------+
| names | count |
+-------+-------+
| name1 | 650   |
+-------+-------+
| name2 | 0     |
+-------+-------+
| name3 | 211   |
+-------+-------+
| name4 | 50    |
+-------+-------+

I want the Y axis to be the count . I want a column to be generated for each name and labelled with the actual names.

This is what I tried:

int max = 0;
for (int i = 0; i < table.Rows.Count; i++)
{
    if (Convert.ToInt32(table.Rows[i][1]) > max) max = Convert.ToInt32(max.Rows[i][1]);
}
chart1.ChartAreas.Add("area");
chart1.ChartAreas[0].AxisY.Minimum = 0;
chart1.ChartAreas[0].AxisY.Maximum = max;
chart1.ChartAreas[0].AxisY.Interval = max/ 10;

for (int i = 0; i < table.Rows.Count; i++)
{
    chart1.Series.Add(table.Rows[i][0].ToString());
}
for (int i = 0; i < table.Rows.Count; i++)
{
    chart1.Series[i].Points.AddXY(table.Rows[i][0].ToString(), Convert.ToInt32(table.Rows[i][1]));
}

And this is what I get, which is not quite what I expected:

Answer 1

Change this:

for (int i = 0; i < table.Rows.Count; i++)
{
    chart1.Series.Add(table.Rows[i][0].ToString());
}
for (int i = 0; i < table.Rows.Count; i++)
{
    chart1.Series[i].Points.AddXY(table.Rows[i][0].ToString(),  
                                  Convert.ToInt32(table.Rows[i][1]));
}

to this:

Series S = chart1.Series.Add("names");

for (int i = 0; i < table.Rows.Count; i++)
{
    S.Points.AddXY(table.Rows[i][0].ToString(), Convert.ToInt32(table.Rows[i][1]));
}

Your original code added one series for each row and one datapoint to each series. This made the chart place them all beside each other and display their sole point, each with the unique series color..

The new code creates only one series and adds all datapoints to its Points collection.